Configurable calibration test XY grid

This is a very simple SCAD file used for generating XY grids for calibration testing.

Printing note: unless you set a high enough margin print without skirt and brim!

# Customization info
All relevant parameters are customizable - the **bed size**, **margins** (gap between bed edges and the grid), layer height and width and also the **multiplier** that says how many "holes" there will be per dimension. The script also *supports different X and Y dimensions* (in case your bed's height and